Scag Power Equipment STT User manual

MODEL STT
THIS MANUAL CONTAINS THE OPERATING
INSTRUCTIONS AND SAFETY INFORMA-
TION FOR YOUR SCAG MOWER. READING
THIS MANUAL CAN PROVIDE YOU WITH
ASSISTANCE IN MAINTENANCE AND AD-
JUSTMENT PROCEDURES TO KEEP YOUR
MOWER PERFORMING TO MAXIMUM EFFI-
CIENCY. THE SPECIFIC MODELS THAT THIS
BOOK COVERS ARE CONTAINED ON THE
INSIDE COVER. BEFORE OPERATING YOUR
MACHINE, PLEASE READ ALL THE INFOR-
MATION ENCLOSED.
PART NUMBER 03059
OPERATOR’S MANUAL

FAILURE TO FOLLOW SAFE OPERATING PRACTICES
MAY RESULT IN SERIOUS INJURY.
* Keep all shields in place, especially the grass discharge chute.
* Before performing any maintenance or service, stop the machine and
remove the spark plug wire and ignition key.
* If a mechanism becomes clogged, stop the engine before cleaning.
* Keep hands, feet and clothing away from power-driven parts.
* Read this manual completely as well as other manuals that came
with your mower.
* Keep others off the tractor only one person at a time)
REMEMBER - YOUR MOWER IS ONLY AS SAFE AS THE OPERATOR!
Hazard control and accident prevention are dependent upon the awareness,
concern, prudence, and proper training of the personnel involved in the
operation, transport, maintenance, and storage of the equipment.
WARNING:
Always use the entire serial number listed on the serial number
tag when referring to this product.
This manual covers the operating instructions
and illustrated parts list for:
STT52-22CH with a se ial numbe of 4260001- 4269999
STT52B-22CH with a se ial numbe of 4280001- 4289999
STT61-22CH with a se ial numbe of 4270001- 4279999
STT61B-22CH with a se ial numbe of 4290001- 4299999
STT52-25CH with a se ial numbe of 4300001- 4309999
STT61-25CH with a se ial numbe of 4310001- 4319999
STT52B-25CH with a se ial numbe of 4320001- 4329999
STT61B-25CH with a se ial numbe of 4330001- 4339999
STT52-22KA with a se ial numbe of 4340001- 4349999
STT61-22KA with a se ial numbe of 4350001- 4359999
STT52B-22KA with a se ial numbe of 4360001- 4369999
STT61B-22KA with a se ial numbe of 4370001- 4379999

1
GENERAL INFORMATION
1.1 INTRODUCTION
Your mower was built to the highest standards in the
industry. However, the prolonged life and maximum
efficiency of your mower depends on you following the
operating, maintenance and adjustment instructions in
this manual.
If additional information or service is needed, contact
your Scag Power quipment Dealer.
We encourage you to contact your dealer for repairs. All
Scag dealers are informed of the latest methods to service
this equipment and provide prompt and efficient service
in the field or at their service shop. They carry a full line
of Scag service parts.
USE OF OTHER THAN ORIGINAL SCAG
REPLACEMENT PARTS WILL VOID THE
WARRANTY.
When ordering parts, always give the model and serial
number of your tractor. The serial number plate is
located where shown in Figures 1-1.
For pictorial clarity, some illustrations and figures in this
manual may show shields, guards or plates open or
removed. Under no circumstances should your mower be
operated without these devices in place.
All information i ba ed upon product information
available at the time of approval for printing. Scag
Power Equipment re erve the right to make change
at any time without notice and without incurring any
obligation.
1.2 DIRECTION REFERENCE
The Right and Left, Front and Rear of the
machine are referenced from the operators right and left
when seated in the normal operating position and facing
the forward travel direction.
1.3 SERVICING THE ENGINE AND DRIVE
TRAIN COMPONENTS
The detail servicing and repair of the engine, hydraulic
pumps and gearboxes are not covered in this manual;
only routine maintenance and general service instructions
are provided. For service of these components during the
limited warranty period, it is important to contact your
Scag dealer or find a local authorized servicing agent of
the component manufacturer. Any unauthorized work
done on these components during the warranty period
may void your warranty.
Section 1
Figure 1-1 Tractor Serial Number Plate Location
390S0137
SERIAL NUMBER
PLATE LOCATION
R
MODEL
SERIAL
Division of Metalcraft of Mayville, Inc.
Mayville, Wisconsin 53050
Patents Issued and Pending
MANUFACTURED UNDER ONE OR MORE
OF THE FOLLOWING PATENTS:
PATENTS PENDING
4,487,006
4,885,903
4,920,733
4,967,543
4,991,382
4,998,948
4,118,617

2
SAFETY INFORMATION
2.1 INTRODUCTION
Your mower is only as safe as the operator. Carelessness
or operator error may result in serious bodily injury or
death. Hazard control and accident prevention are
dependent upon the awareness, concern, prudence, and
proper training of the personnel involved in the operation,
transport, maintenance and storage of the equipment.
Make sure every operator is properly trained and
thoroughly familiar with all of the controls before
operating the mower.
READ THIS OPERATORS MANUAL BEFORE
ATTEMPTING TO START YOUR MOWER.
A replacement manual is available from your authorized
Scag Service Dealer or by contacting Scag Power
quipment, Service Department at P.O. Box 152,
Mayville, WI 53050. Please indicate the complete model
and serial number of your Scag product when requesting
replacement manuals.
2.2 SIGNAL WORDS
This symbol means Attention! Become Alert! Your
Safety i Involved!" The symbol is used with the
following signal words to attract your attention to safety
messages found on the decals on the machine and
throughout this manual. The message that follows the
symbol contains important information about safety. To
avoid injury and possible death, carefully read the
message! Be sure to fully understand the causes of
possible injury or death.
Signal Word:
It is a distinctive word found on the safety decals on the
machine and throughout this manual that alerts the
viewer to the existence and relative degree of the hazard.
The signal word WARNING denotes that a hazard
exists on or near the machine that can result in injury or
death if proper precautions are not taken.
The signal word DANG R denotes that an extremely
hazardous situation exists on or near the machine that
could result in high probability of death or irreparable
injury if proper precautions are not taken.
CAUTION:
The signal word CAUTION is a reminder of safety
practices on or near the machine that could result in
personal injury if proper precautions are not taken.
Your safety and the safety of others depends significantly
upon your knowledge and understanding of all correct
operating practices and procedures of this machine.
2.3 BEFORE OPERATION
CONSIDERATIONS
1. NEVER allow children to operate this riding mower.
Do not allow adults to operate this machine without
proper instructions.
2. DO NOT mow when children and/or others are
present.
3. Clear the area to be mowed of objects that could be
picked up and thrown by the cutter blades.
4. DO NOT carry passengers.
WARNING:
Section 2

3
10. DO NOT add fuel to a running or hot engine. Allow
the engine to cool for several minutes before adding
fuel.
11. Keep flammable objects (cigarettes, matches, etc.),
open flames and sparks away from the fuel tank and
fuel container.
12. quipment must comply with the latest requirements
per SA J137 and/or ANSI/ASA S279 when driven
on public roads.
If the mower is driven on public roads, it must
comply with state and local ordinances as well as
SAE J137 and/or A SI / ASAE S279 requirements.
Contact your local authorities for regulations and
equipment requirements.
13. DO NOT operate without the side discharge chute
installed and in the down position.
14. Check the blade mounting bolts at frequent intervals
for proper tightness.
15. Make sure all hydraulic fluid connections are tight
and all hydraulic hoses and lines are in good
condition before starting the machine.
2.4 OPERATION CONSIDERATIONS
1. Know the function of all controls and how to stop
quickly.
2. Reduce speed and exercise extreme caution on slopes
and in sharp turns to prevent tipping or loss of
control. Be especially cautious when changing
directions on slopes.
DO NOT operate on steep slopes. To check a
slope, attempt to back up it (with the cutter deck
down). If the machine can back up the slope
without the wheels slipping, reduce speed and use
extreme caution. ALWAYS FOLLOW OSHA
APPROVED OPERATION.
6. Operator hearing protection is recommended,
particularly for continuous operation of the mower.
Wear suitable hearing protection. Prolonged
exposure to loud noise can cause hearing
impairment or loss.
7. Keep the machine and attachments in good
operating condition. Keep all shields and safety
devices in place. If a shield, safety device or decal
is defective or damaged, repair or replace it before
operating the machine.
This machine is equipped with an interlock
system intended to protect the operator and
others from injury. This is accomplished by
2.3 BEFORE OPERATION
CONSIDERATIONS (CONT'D)
5. DO NOT wear loose fitting clothing that could get
tangled in moving parts. Do not operate the machine
wearing shorts; always wear adequate protective
clothing including long pants. Wearing safety
glasses, safety shoes and a helmet is advisable and is
required by some local ordinances and insurance
regulations.
Section 2
WARNING:
preventing the engine from starting unless the
deck drive is disengaged, the parking brake is on,
the steering control levers are in the neutral
position and the operator is in the seat. The
system shuts off the engine if the operator leaves
the seat with the deck drive engaged and/or the
steering control levers are not in the neutral
postion and the parking brake is not engaged.
Never operate equipment with the interlock system
disconnected or malfunctioning.
8. Be sure the interlock switches are functioning
correctly.
9. Fuel is flammable; handle it with care. Fill the fuel
tank outdoors. Never fill it indoors. Use a funnel or
spout to prevent spillage. Clean up any spillage
before starting the engine.
-NOTE-
WARNING:

4
Section 2
2.4 OPERATION CONSIDERATIONS
(CONT'D)
3. To prevent tipping or loss of control, do not start or
stop suddenly, avoid unnecessary turns and travel at
reduced speed.
4. When using any attachment, never direct the
discharge of material toward bystanders or allow
anyone near the machine while in operation.
5. Before attempting to start the engine, with the
operator in the seat, disengage power to the cutter
deck, place the steering control levers in the neutral
position and engage the parking brake.
6. If the mower discharge ever plugs, shut off the
engine, remove the ignition key, and wait for all
movement to stop before removing the obstruction.
Do not use your hand to dislodge the clogged
discharge chute. Use a stick or other device to
remove clogged material.
7. Be alert for holes, rocks, roots and other hidden
hazards in the terrain. Keep away from any dropoff.
Beware of overhead obstructions (low limbs, etc.),
underground obstacles (sprinklers, pipes, tree roots,
etc.). Cautiously enter a new area. Be alert for
hidden hazards.
8. Disengage power to cutter deck before backing up.
Do not mow in reverse unless absolutely necessary
and then only after observation of the entire area
behind the mower.
9. DO NOT turn sharply. Use care when backing up.
10. Disengage power to cutter deck before crossing
roads, walks or gravel drives.
11. Mow only in daylight or good artificial light.
12. Take all possible precautions when leaving the
machine unattended, such as disengaging the mower,
lowering the attachments, setting the parking brake,
stopping the engine, and removing the key.
13. Disengage power to the attachments when
transporting or when not in use.
14. The machine and attachments should be stopped and
inspected for damage after striking a foreign object,
and damage should be repaired before restarting and
operating the machine.
15. DO NOT touch the engine or the muffler while the
engine is running or immediately after stopping.
These areas may be hot enough to cause a burn.
16. DO NOT run the engine inside a building or a
confined area without proper ventilation. xhaust
fumes are hazardous and could cause death.
2.5 MAINTENANCE CONSIDERATIONS
1. Never make adjustments to the machine with the
engine running unless specifically instructed to do so.
If the engine is running, keep hands, feet, and
clothing away from moving parts.
2. Remove the key from the ignition switch to prevent
accidental starting of the engine when servicing or
adjusting the machine.
3. Keep all nuts, bolts and screws tight, to ensure the
machine is in safe working condition. Check blade
mounting bolts frequently to be sure they are tight.
4. Do not change the engine governor settings or
overspeed the engine. See the engine operator's
manual for information on engine settings.
5. To reduce fire hazard, keep the engine free of grass,
leaves, excessive grease, oil and dirt.
6. Hydraulic fluid i under high pre ure. Keep body
and hands away from pinholes or nozzles that eject
hydraulic fluid under high pressure. If you need
service on your hydraulic system, please see your
authorized Scag dealer.
7. Hydraulic fluid under high pressure may have
sufficient force to penetrate skin and cause serious
injury. If hydraulic fluid is injected into the skin, it
must be surgically removed within a few hours by a
doctor or gangrene may result.

5
Section 2
2.6 SAFETY AND INSTRUCTIONAL DECALS
DANGER
SPINNING BLADE
KEEP CLEAR
CONTACT CAN INJURE
48071
ROTATING BLADES AND BELTS
WARNING
KEEP HANDS, FEET & CLOTHING CLEAR
KEEP ALL GUARDS IN PLACE
SHUT OFF ENGINE & DISENGAGE BLADE
CLUTCH BEFORE SERVICING
CLEAR AREA OF DEBRIS BEFORE MOWING
USE CAUTION IN DIRECTING DISCHARGE
KEEP BYSTANDERS, CHILDREN & PETS AWAY
READ INSTRUCTION MANUAL BEFORE OPERATING
DO NOT OPERATE WITHOUT DISCHARGE CHUTE, MULCHING
KIT, OR ENTIRE GRASS CATCHER INSTALLED
481040
WARNING
INSTALL BELT COVER BEFORE
OPERATING MACHINE
READ OPERATOR'S MANUAL
481039
CAUTION
AVOID INJURY FROM
BURNS. SHUT OFF
ENGINE BEFORE
REMOVING FUEL
TANK CAP.
481272
390S0150
CAUTION
KEEP BYSTANDERS AWAY
CAUTION
BEFORE OPERATING
READ OPERATOR'S
MANUAL AND SAFETY
INSTRUCTIONS
481567
START / DRIVE
PROCEDURE
ENGAGE PARKING BRAKE
DISENGAGE MOWER DECK DRIVE
MOVE CONTROL HANDLES
TO NEUTRAL LOCK POSITION
START ENGINE
RELEASE PARKING BRAKE
SELECT FORWARD OR
REVERSE SPEED WITH
HYDRO CONTROL HANDLES
481568
FORWARD
REVERSE
FR
IMPORTANT ADJUSTMENT
PROCEDURES
READ OPERATOR'S MANUAL
FOR MORE DETAILS
NEUTRAL ADJUSTMENT
TRACKING ADJUSTMENT
FREE WHEEL OPERATION
HYDRAULIC TANK FLUID LEVEL
Check tire pressure-
(Drive tires - 12 psi,
Caster tires - 25 psi)
To move machine without running
the engine, rotate both dump valve
levers located at the LH side of
the pumps CCW 1/2 turn to
"freewheel" positions. Return
levers to original position to
operate the mower.
If the machine pulls to the right,
adjust LH control linkage CCW to
slow left wheel. If the machine
pulls to the left, adjust RH control
linkage CCW to slow right wheel.
Readjust neutral if necessary.
With an operator in the seat,
engine running, control levers
in neutral and the parking brake
disengaged - adjust control
linkage. Loosen jam nuts. If wheel
rotates forward, adjust turnbuckle
CCW. If wheel rotates rearward,
adjust turnbuckle CW. Adjust until
drive wheel stops turning. Tighten
jam nuts. Repeat for opposite side.
Check hydraulic fluid level
daily while fluid is cool.
Fluid level should be 3-1/4"
below top of filler neck.
Fill with SAE 20W50 motor oil only.
IMPORTANT!:
Do not overfill. Room for hot
fluid expansion must be allowed
or resulting expansion may cause
leaks in the system.
Gearbox lubricant:
SAE 80W90 gear oil
481588
Loosen jam nuts
Rotate turnbuckle

6
SPECIFICATIONS
Section 3
3.1 ENGINE
General Type ............................................................................. Heavy Duty Industrial/Commercial Gasoline
Brand ......................................................................................... Kohler, 22HP Spec. #PS-76510) 25HP Spec. #PS-68579)
Kawasaki, 22HP Spec. # FD661D-AS0201)
Model ......................................................................................... Kohler Command, Kawasaki FD661D
Horsepower ................................................................................ 22 HP at 3600 RPM Model STT52&52b-22CH, STT61&61B-22CH)
25 HP at 3600 RPM Model STT52&52B-25CH, STT61&61B-25CH)
22 HP at 3600 RPM Model STT52&52B-22KA, STT61&61B-22KA)
Type ........................................................................................... 4 Cycle Gasoline, Twin Cylinder, Horizontal Shaft
Displacement ............................................................................ 22HP Kohler 674 cc., 25HP Kohler 725cc., 22HP Kawasaki 617cc
Cylinders ................................................................................... 2 with Cast Iron Sleeves
Governor .................................................................................... Mechanical Type with Variable Speed Control Set At 3600 RPM
Idle Speed .................................................................................. 1400 RPM
Kohler Fuel Pump Group .......................................................... Mechanical Type Fuel Pump with In-Line Fuel Filter, Fixed Jet
Carburetor with Smart-Choke and Fuel Shutdown Solenoid
Kawasaki Fuel Pump Group ..................................................... Electric Fuel Pump with In-Line Fuel Filter,Fixed Jet Downdraft
Carburetor.
Fuel ............................................................................................ Non-Leaded Gasoline with a Minimum Octane Rating of 87
Oil Pump Group ........................................................................ Positive Displacement Gerotor Oil Pump with Remote Oil
Filter
Starter ........................................................................................ Electric Starting with Solenoid Shift Starter
Belts: .......................................................................................... Kevlar cord. Self-adjusting, Self-tightening
Deck Drive Belt ..................................................................... Scag Part Number - 481460
Pump Drive Belt .................................................................... Scag Part Number - 481461
Kawasaki Fan Belt .................................................................. Part Number - Mitsubishi 59011-2056 N/A Through Scag)
3.2 ELECTRICAL
Battery ....................................................................................... 12 Volt
Charging System ....................................................................... Alternator
Charging Output ....................................................................... 12 Volt, 15 Amp
System Polarity .......................................................................... Negative Ground
Starter ........................................................................................ 12 Volt Electric Ring Gear Type, Key and Solenoid Operated
Interlock Switches ..................................................................... Seat, Neutral Control, Mower Engagement BBC), Parking Brake
Instrument Panel ....................................................................... Ammeter, Hourmeter, Key Switch, Throttle Lever, Manual Choke,
BBC Switch, Fuses and Safety Start module, Temp. gauge KA)
Fuses .......................................................................................... Two 2) 20 Amp
3.3TRACTOR
Drive System ............................................................................. Hydraulic Drive with Two Variable Displacement Pumps and Two
Cast-iron High Torque Motors
Hydrostatic Pumps ..................................................................... Two Hydro-Gear BDP 10L Pumps with Dump Valves for
movement without running the engine
Drive Wheel Motors .................................................................. Two Ross Model MB 15 cu. inch Cast-iron High Torque Motors
Steering/Travel Control ............................................................. Twin Lever Fingertip Steering Control with Individual Control to
Each Wheel with Gas Spring Dampers
Parking Brake ............................................................................ Lever Actuated Linkage to Brakes on Both Drive Wheel Axles
Wheels:
2) Front Caster .................................................................... 13 X 5.00 Four-Ply
2) Drive ................................................................................. 23 X 10.5 X 12 Four-Ply Pneumatic Tubeless, Radius Edge, 52"
................................................................................................... 24X12.0X12.0 Four-Ply Pneumatic Tubeless, Radius Edge, 61"
Fuel Tank ................................................................................... 10-Gallon Seamless Polyethylene Tank with Fuel Gauge Fill Cap
Tire Pressure:
Front Caster.......................................................................... 25 PSI
Drive ..................................................................................... 12 PSI
Seat ............................................................................................ Padded, Thick Cushion with Extra Spring Support

7
3.3 TRACTOR (CONT'D)
Travel Speed:
Forward ................................................................................ 0-10 MPH
Reverse ................................................................................. 0-5 MPH
3.4 CUTTER DECK
Type: .......................................................................................... Floating, Adjustable, Anti-scalping, Hybrid Design Combines
Out-front and Belly-mount Designs
Construction: ............................................................................. 10-gauge steel reinforced with 7-gauge 3/16") Support Plate.
7-gauge 3/16") deck skirt with 3/8" front plate.
True Cutting Width: .................................................................. 52" 132.0 cm), 61: 155.0 cm)
Cutting Height Adjustment: ...................................................... Foot Operated Lever Adjustment from Operator's Seat, 1.00" to
6.00" in 1/2"increments
Cutter Blades: ............................................................................ .204 Thick, Milled Edge, 5150 Alloy Steel
SMT 52: Three 3) 18" blades
SMT 61: Three 3) 21" blades
Blade Engagement: .................................................................. Electric Blade Engagement Clutch with Control Panel Switch
Connected to the Cutter Deck Gearbox through a Drive Shaft.
Discharge Opening: .................................................................. Extra Wide 11.5" Discharge Opening with Spring Loaded
Discharge Chute
Caster Wheels: ........................................................................... 13x 5.00 Four-Ply
Spindles: .................................................................................... Heavy-duty 1-1/8" Top Dimension Spindle Shaft, Cast Housing,
Taper Roller Bearing, Low Maintenance with Top Access Grease
Fitting and Grease Overfill Relief Poppet
Spindle Pulleys: ......................................................................... Cast-iron with Easily Removed Taper Hubs
Cutter Deck Belts: ..................................................................... B-section with Kevlar Cord. Self-adjusting, Self-tightening
SMT52 ................................................................................. Scag Part Number - 481557
SMT61 ................................................................................. Scag Part Number - 481558
Electric Clutch Type .................................................................. Warner Mag Stop Electric Clutch
Drive Shaft ................................................................................ Quick-disconnect Shaft With Two High Speed U-Joints
3.6 HYDRAULIC SYSTEM
Hydraulic Oil Filter ................................................................... 10 Micron Spin-on Element Type
Hydraulic Reservoir ................................................................... Nylon; 6 Quart Capacity
3.7 WEIGHTS AND DIMENSIONS 52" MODEL 61" MODEL
Length ........................................................................................ 76" 79"
Tracking Width ......................................................................... 51" 51"
Overall Width ............................................................................ 62" 72"
Overall Height ........................................................................... 30" 30"
Operating Weight ...................................................................... 1160# 1200#
Section 3
3.8 PRODUCTIVITY
The following chart will aid you in determining how many acres your Scag mower will cut per day.
The chart is an estimate based on 8 hours per day cutting time at 4 MPH with an allowance for overlap and turns.
Cutting Width: 36" 48" 52" 61" 72"
Acres Per Day: 9.5 12.5 13.5 16 19
-NOTE-
The machine will travel at 10mph for
transport purposes. For best cutting
performance the forward travel speed
should be adjusted depending upon the
cutting conditions.

7
Section 4

8
Section 4
OPERATING INSTRUCTIONS
Do not attempt to operate this mower unless you
have read this manual. Learn the location and
purpose of all controls and instruments before you
operate this mower.
4.1 CONTROLS AND INSTRUMENT
IDENTIFICATION
Before operating the mower, familiarize yourself with all
mower and engine controls. Knowing the location,
function and operation of these controls is important for
safe and efficient operation of the mower.
CAUTION:
1. Ignition Switch (Figure 4-1). The ignition switch is
used to start the engine and has three positions; OFF,
ON, and ST RT.
2. Mower Deck Switch (Figure 4-1). Used to
engage and disengage the mower drive system.
Pulling up on the switch will engage the deck drive.
Pushing down on the switch will disengage the deck
drive.
3. Engine Choke Control (Figure 4-1). Used to
start a cold engine.
4. Engine Throttle Control (Figure 4-1). Used to
control the engine speed. Pushing the lever forward
increases engine speed. Pulling the lever back
decreases engine speed. Full back position is the
IDLE position. Full forward is the cutting position.
Figure 4-1 Controls and Instruments
PULL OUT TO ENGAGE
ON
START
PUSH IN TO DISENGAGE
OFF
481640
MOWER DECK
CHOKE
481348
aljalefjairjf;o3rf
af krjf ;wso rgf
aljalefjairjf;o3rf
aljal efj airjf;o3rf
OFF
OFF
OFF
E
481239
AMMETER
LEFT STEERING
CONTROL
MOWER DECK SWITCH
IGNITION SWITCH
HOURMETER FUEL GAUGE
DUMPVALVEDUMPVALVE
FUSES
ENGINE
CHOKE
CONTROL
ENGINETHROTTLE
CONTROL
RIGHT STEERING
CONTROL
DECK LIFT
DECK RELEASE
390S0142
PARKING BRAKE
CONTROL
CUTTING HEIGHT
ADJUSTMENT
PULL OUT TO ENGAGE
ON
START
PUSH INTO DISENGAGE
OFF
481669
MOWER DECK
AMMETER
MOWER DECK SWITCH
IGNITION SWITCH
HOURMETER
TEMPERATURE GAUGE
KAWASAKI MACHINE ONLY

9
Section 4
5. mmeter (Figure 4-1). Indicates the condition of
the charging system. When the engine is running the
needle should be toward the positive end of the meter.
If the needle is toward the negative end of the meter,
this indicates a discharge condition and the machine
should be taken in for service.
6. Hourmeter (Figure 4-1). Indicates the number of
hours the engine has been operated. It operates
whenever the ignition key switch is in the ON
position. It can be used to keep track of maintenance
intervals and the amount of time required to perform
various tasks.
7. Fuse Holders (Figure 4-1). Two 20-amp fuses
protect the mowers electrical system. To replace
fuses, pull fuse out of the socket and install a new
fuse.
8. Left Steering Control (Figure 4-1). Used to control
the mower's left wheel when traveling forward or
reverse.
9. Right Steering Control (Figure 4-1). Used to
control the mower's right wheel when traveling
forward or reverse.
10. Parking Brake Control (Figure 4-1). Used to
engage and disengage the parking brakes. Pull the
lever back to engage the parking brakes. Push the
lever forward to disengage the parking brakes.
11. Fuel Tank Gauge (Figure 4-1). Indicates the
amount of fuel in the fuel tank.
12. Dump Valve Control Levers (Figure 4-2). Located
on the hydraulic pumps, used to free-wheel the
mower. Rotating the levers clockwise until they stop
allows the unit to move under hydraulic power. The
levers must be in this position during operation of the
mower. Rotating the levers counter-clockwise allows
the mower to be moved by hand (free-wheeling).
13. Deck Lift Foot Lever (Figure 4-1). Used to raise
and lower the cutter deck.
14. Cutting Height djustment (Figure 4-1). Used to
set the cutter deck at the desired cutting height.
Figure 4-2 Dump Valve Control
4.2 SAFETY INTERLOCK SYSTEM
The mower is equipped with a safety interlock system
that prevents the engine from starting unless the deck
drive is disengaged, the parking brake is engaged, the
steering control levers are in the neutral position and the
operator is in the seat. The interlock system shuts off the
engine if the operator leaves the seat with the steeering
control levers not in the neutral position and/or the cutter
blades engaged and the parking brake not engaged.
Never operate the mower with the interlock
system disconnected or malfunctioning. Do not
disengage or bypass any switch; injury to
yourself and others or property damage could
result.
4.3 INITIAL RUN-IN PROCEDURES (First
Day of Use or Approximately 10 Hours)
1. Check all belts for proper alignment and wear at 2, 4
and 8 hours.
15. Deck Release Lever (Figure 4-1). Used to lock the
cutter deck in the transport position. Push the foot
pedal forward and lift up on the release lever to
release the cutter deck for normal mowing.
16. Temperature Gauge (Figure 4-1). Indicates the
operating temperature of the engine. Used on the
Kawasaki liquid cooled engine only.
WARNING:
390S0141
DUMP VALVE
CONTROL LEVER

10
Section 4
2. Change the engine oil and oil filter after the first 5
hours of operation. (See Section 7.4.)
3. Check hydraulic oil level in reservoir. (See Section
7.3.)
4. Check for loose hardware. Tighten as needed.
5. Check interlock system for proper operation. (See
Section 4.2.)
6. Check tire pressure. djust pressure if necessary.
(See Section 7.10)
4.5 GROUND TRAVEL AND STEERING
4.4 STARTING THE ENGINE
DO NOT USE STARTING FLUIDS. Use of starting
fluids in the air intake system may be potentially
explosive or cause a “runaway” engine condition
that could result in engine damage and/or personal
injury.
1. Be sure the fuel shutoff valve, located behind the
operator's seat, is completely open. (See section 7.5.)
2. Sit in the operators seat and place the steering
control levers in the neutral position.
3. Engage the parking brake.
4. If the engine is cold, choke the engine as needed.
5. Move the engine throttle control to about half engine
speed.
6. Turn the ignition key to the ST RT position and
release the key as soon as the engine starts. Do not
hold the key in the ST RT position for more than 15
seconds at a time. llow at least 60 seconds between
each cranking attempt to prevent overheating of the
starter motor. Prolonged cranking can damage the
starter motor and shorten battery life.
7. llow engine to warm before operating the mower.
CAUTION:
-IMPORTANT-
If you are not familiar with the operation of a
machine with lever steering and/or hydrostatic
transmissions, the steering and ground speed
operations should be learned and practiced in
an open area, away from buildings, fences, or
obstructions. Practice until you are comfortable
with the handling of the machine before
attempting to mow. earn the operation on flat
ground before operating on slopes.
-IMPORTANT-
Start practicing with a slow engine speed and
slow forward travel.
earn to feather the steering controls to obtain
a smooth operating action.
Practice operating the mower until you are
comfortable with the controls before proceeding
to mow.
Forward Travel
To travel forward with the mower, disengage the parking
brake and slowly push the steering control levers forward
an equal distance. The further the steering control levers
are pushed forward the greater the forward speed will be.
To increase the speed, push the steering control levers
further forward and to decrease the speed, pull the
steering control levers back.
To stop the forward travel, pull the steering control levers
back to the neutral position.
To steer the mower left while traveling forward, pull the
left steering lever back. The further the lever is pulled
back, the quicker the mower will turn left.
To steer the mower right while traveling forward, pull the
right steering control lever back. The further the lever is
pulled back, the quicker the mower will turn right.

11
Section 4
To steer right while traveling in reverse, allow the right
steering control lever to move forward. The further the
control is allowed to move forward, the quicker the
mower will turn right.
To stop the reverse travel, allow the steering control
levers to return to the neutral position. If the mower is to
be parked, engage the parking brake.
4.6 ENGAGING THE DECK DRIVE (CUTTER
BLADES)
1. Set the throttle at about 3/4 speed. Do not attempt to
engage the deck drive at high speed as this shortens
the electric clutch life  use only moderate engine
speed when engaging the deck drive.
2. Engage the deck drive by pulling out on the yellow
switch, located on the instrument panel, (Figure 4-3)
to the engage position.
-NOTE-
A squealing noise may be heard when engaging
or disengaging the deck drive. It is caused by
the electric clutch plates meshing as the mower
comes up to speed.
3. To disengage the deck drive, push the switch in to the
disengage position.
4. lways operate the engine at full throttle to properly
maintain cutting speed. If the engine starts to lug
down, reduce the forward speed and allow the engine
to operate at maximum RPM.
CAUTION:
Reverse Travel
-NOTE-
Smooth operation of the steering levers will
produce smooth mower operation. While
learning the operation of the steering controls,
keep the travel speed low.
-IMPORTANT-
Do not travel forward over a curb. The mower
will hang up on the curb. Raise the deck and
travel backwards over the curb at a 45 degree
angle. (see section 4.13 for cutter deck raising
instructions)
Disengage power to the mower before backing up.
Do not mow in reverse unless absolutely
necessary and then only after observation of the
entire area behind the mower.
To travel in reverse, pull both handles back. Keep the
travel speed low while traveling in reverse.
-NOTE-
The mower will not travel straight in reverse.
Slight adjustments must be made using the
steering controls.
To steer left while traveling in reverse, allow the left
steering control lever to move forward. The further the
control is allowed to move forward, the quicker the
mower will turn left.
Before backing up, observe the rear for persons
and obstructions. Clear the area before backing
up. Possible injury or property damage could
occur.
CAUTION:
Figure 4-3 Cutter Engage Switch
STT99CES
PULL UP TO ENGAGE
PUSH DOWN TO DISENGAGE

12
Section 4
4.7 HILLSIDE OPERATION
DONOToperateon steep slopes. To check a slope,
attempt to back up it (with the cutter deck down).
If the machine can back up the slope without the
wheels slipping, reduce speed and use extreme
caution. ALWAYS FOLLOW OSHA APPROVED
OPERATION.
1. The mower has been designed for good traction and
stability under normal mowing conditions. However,
caution must be used when traveling on slopes,
especially when the grass is wet. Wet grass reduces
traction and steering control.
2. To prevent tipping or loss of control, do not start or
stop suddenly, avoid unnecessary turns and travel at
reduced speed.
3. Keep tires properly inflated.
4.8 PARKING THE MOWER
1. Place the steering control levers in the neutral
position.
2. Disengage the cutter blades
3. Slow the engine to idle speed.
4. Engage the parking brake.
5. Turn the ignition key to the OFF position and remove
the key.
4.9 AFTER OPERATION
1. Wash the entire mower after each use. Do not use
high pressure spray or direct the spray onto electrical
components.
WARNING:
-IMPORTANT-
Do not wash a hot or running engine. Cold
water will damage the engine. Use compressed
air to clean the engine if it is hot.
2. Keep the entire mower clean to inhibit serious heat
damage to the engine or hydraulic oil circuit.
3. Check the drive belts for proper alignment and any
signs of wear. Correct and adjust if necessary.
4. fter the mower has cooled down, fill the fuel tank
with fresh, clean fuel at the end of every day of
operation.
5. Check the tire pressure. djust pressure if necessary.
To avoid injury from burns, allow the mower to
cool before removing the fuel tank cap and
refueling.

13
Section 4
4.10 REMOVING CLOGGED MATERIAL
ROTATING BLADES
NEVER PUT YOUR HANDS INTO THE DISCHARGE
CHUTE FOR ANY REASON! Shut off the engine and
remove the key and only then use a stick or similar
object to remove material if clogging has occurred.
1. If the discharge chute becomes clogged, shut off the
engine and remove the ignition key. Using a stick or
similar item, dislodge the clogged material. Then
resume normal mowing.
4.11 MOVING MOWER WITH ENGINE
STOPPED
To free-wheel or move the mower around without the
engine running, place the dump valve levers in the FREE-
WHEEL position (Figure 4-2). Disengage the parking
brake and move the mower by hand. The dump valve
levers must be returned to the DRIVE position to drive
the mower.
4.12 RECOMMENDATIONS FOR MOWING
1. Do not mow with dull blades. dull blade will tear
grass, resulting in poor lawn appearance and require
extra power.
2. The discharge chute must not be removed and must
be kept in the lowest position to deflect grass
clippings and thrown objects downward. Direct the
side discharge away from sidewalks or streets to
minimize cleanup of clippings. When mowing close
to obstacles, direct the discharge away from the
obstacles to reduce the chance of property damage by
thrown objects.
3. Cut grass when it is dry and not too tall. Do not cut
grass too short (cut off 1/3 or less of existing grass
for best appearance). Mow frequently.
4. Keep mower and discharge chute clean.
5. When mowing wet or tall grass, mow the grass twice.
Raise the mower to the highest setting for the first
pass and then make a second pass to the desired
height.
6. Use a slow travel speed for trimming purposes.
7. Operate the engine at full throttle for best cutting.
Mowing with a lower RPM causes the mower to tear
the grass. The engine is designed to be operated at
full speed.
8. Use the alternate stripe pattern for best lawn
appearance. Vary the direction of the stripe each
time the grass is mowed to avoid wear patterns in the
grass.

14
Section 4
4.13 ADJUSTING CUTTING HEIGHT
The mower deck can be adjusted from a height of 1-inch
to 6 inches at 1/2-inch intervals. To adjust the cutting
height:
Do not adjust the cutting height with the mower
blades rotating. Disengage the power to the cutter
blades and then adjust cutting height.
1. Disengage the power to the cutter blades.
2. Push the cutting height adjustment foot pedal all the
way forward using your right foot until it locks in
place. (Figure 4-6).
3. Insert the lanyard pin into the cutting height index at
the desired cutting height. Push forward on the deck
lift foot lever, hold in place and lift up on the deck
release lever, (Figure 4-7). Slowly release the foot
pedal. deck height decal is located on the cutting
height index as an aid in adjusting the deck to the
desired height. (Figure 4-6).
390S0151
DECK
RELEASE
LEVER
Figure 4-7 Deck Release Lever
WARNING:
390S0140
LANYARD PIN
HEIGHT ADJUSTMENT PEDAL
CUTTING
HEIGHT
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
481543
Figure 4-6 Adjusting Cutting Height

Section 5
15
Stringers - Occasional Low engine RPM Run engine at full RPM
Blades of Uncut
Grass Ground speed too fast Slow speed to adjust for conditions
Wet grass Cut grass after it has dried out
Dull blades, incorrect sharpening Sharpen blades
Deck plugged, grass accu ulation Clean underside of deck
Belts slipping Adjust belt tension
Streaking - Strips of Dull, worn blades Sharpen blades
Uncut Grass in Cutting
Path Incorrect blade sharpening Sharpen blades
Low engine RPM Run engine at full RPM
Belt slipping Adjust belt tension
Deck plugged, grass accu ulation Clean underside of deck
Ground speed too fast Slow speed to adjust for conditions
Wet grass Cut grass after it has dried out
Bent blades Replace blades
Width of Deck
SGB018
CONDITION CAUSE CURE
Width of Deck
SGB020
Width
of
Deck
Width
of
Deck
SGB019
Streaking - Strips of Not enough overlapping Increase the overlap of each
Uncut Grass Between between rows pass
Cutting Paths
TROUBLESHOOTING CUTTING CONDITIONS

Section 5
16
Uneven Cut on Flat Lift worn fro blade Replace blade
Ground - Wavy
High-Low Blade upside down Mount with cutting edge toward
Appearance, ground
Scalloped Cut, or
Rough Contour Deck plugged, grass accu ulation Clean underside of deck
Too uch blade angle (deck pitch) Adjust pitch and level
Deck ounted i properly See your authorized SCAG dealer
Bent spindle area See your authorized SCAG dealer
Dull blade Sharpen blade
TROUBLESHOOTING (CONT'D)
Sloping Ridge Across Tire pressures not equal Check and adjust tire pressure
Width of Cutting Path
Wheels uneven Check and adjust tire pressure
Deck ounted incorrectly See your authorized SCAG dealer
Deck not level side-to side Check for level and correct
CONDITION CAUSE CURE
Uneven Cut on Uneven ground May need to reduce ground speed,
Uneven Ground - raise cutting height, and/or change
Wavy Appearance, direction of cut
High-Low Scalloped
Cut, or Rough Contour
Width of Deck
SGB020
Width of Deck
SGB021
Width of Deck
SGB023

Section 5
17
Scalping - Blades Low tire pressures Check and adjust pressures
Hitting Dirt or
Cutting Very Close to Ground speed too fast Slow speed to adjust for conditions
the Ground
Cutting too low May need to reduce ground speed,
raise cutting height, change direction
of cut, and/or change pitch and level
Rough terrain May need to reduce ground speed,
raise cutting height, and/or change
direction of cut
Ground speed too fast Slow speed to adjust for conditions
Wet grass Cut grass after it has dried out
Step Cut -Ridge Blades not ounted evenly Adjust pitch and level
in Center of
Cutting path Bent blade Replace blade
Internal spindle failure See your authorized SCAG dealer
Mounting of spindle incorrect See your authorized SCAG dealer
Slope Cut - Sloping Bent spindle ounting area See your authorized SCAG dealer
Ridges Across Width
of Cutting Path Internal spindle failure See your authorized SCAG dealer
Bent deck housing See your authorized SCAG dealer
CONDITION CAUSE CURE
Width of Deck
SGB024
Width of Deck
SGB025
Width of Deck
SGB022
TROUBLESHOOTING (CONT'D)